In which medium is Jamini Roy's painting made?

The correct answer is Tempera.

Key Points Jamini Roy​:

• Jamini Roy was a Bengali Indian painter and remains a famous pupil of Abanindranath Tagore. 
• He created a painting in a unique style of combining his own style with qualities of native folk arts.
• He adopted tempera techniques for his painting.
• He was honored with Padma Bhushan in the year 1954.
• His painting was a combination of the nominal brush strokes of the Kalighat style with elements of tribal art from Bengal.

Additional Information

• Oil painting is the process of painting with pigments with a medium of drying oil as a binder.
• A watercolor wash refers to a layer of color that is somewhat transparent and applied with diluted paint. 
• Pastel painting refers to completed works in which the entire surface area is covered in pastel.